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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91372449ff11bc02c2167052aa50dc759153d84f24f7eea6dec693b20b98b2b7' 
  AND token = 'oPb4Q2g3R1rsxKII8pSN2TODj0nd0727HxHqyYVdwDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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