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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3d15cb9b66eba9364d493e288a14b4c532c1ea919e9e4294b9fc2cbb1526b6' 
  AND token = 'Zviw8ZV0wTfJlIhryfKBETnkbJAZn+6cMIrNlmwqomU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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