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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca56d935df0a7e756b2541bdac0a30cefbbcf70592e1934ec86a7fa08f253659' 
  AND token = 'BfHPyAEQnY0eQx7UgO8Kp3r8qBa5XblifKILaU3kVkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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