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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da5360e22ad8df0b06024a5be7d12b6debdeba7330607232a939ea7d331ca3f' 
  AND token = 'QGEQ4AKMvltMMyt/L1IQxGLIboSugMjY1I1i2kP6alE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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