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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5be4e14b7794a654d2e4a940ca3de7596764806ce982ac819a0472e795dc6db' 
  AND token = 'zjk3+FgEpsveJdLL7WX22KynN30+ZguurcwIWuqqMfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}