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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef66be6c300fb1ee26a3134974f51c006009c95de05a34c47bb4630ad78fa6ec' 
  AND token = 'wpJenDvhIco1qvadf0ZISc31VXPWfdNhg74rnwG70Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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