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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ba9ed191571ca75c7bf2b1a9be4e4e3b3bc5cf9da7fb4f730d1c5471f937e6' 
  AND token = 'qckBVpgBhGjh1/dMUFnOSaC+QbmRbDKIT1B+18aRyYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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