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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3bcfc2d1d9e1acaa034e014e781f057cf8f69d3bdbcd73c4f53a69c9bf5b90' 
  AND token = 'pqJauOz97O6Z/dHfrnImMRz4tzCqlmq0bFEJdNcY3mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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