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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640f9b3df92604e5f84bae54c666e6dc3f1bc14a14144cbaff7de7f6087bc0c4' 
  AND token = '6xzItNPHDEYIuR2ftDYjMRnjotu/4FXM4rDKCjKPToA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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