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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e24896782a4c947a5c9c49f454faf396472d778d042502b7a51d86d0533775' 
  AND token = 'C5X5I2fgyt5MkUmXbFCm6Py3mdXrQ7IRIUZtD0iY26Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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