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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b680af1d14465c62f9040cbe30f2c9d79341df7a4beedfbbe6ea7d71a8a5da' 
  AND token = 'XqIAp+p3xPSnp3TjvfyufyPloL7AisTvxiGzhKd24Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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