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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021b0cfaf00bf7cda6c745bb6df9c42b1db85af56a38f23ec7585433c35b8226' 
  AND token = 'VHrnFFCUAdQm2ewca3dBa6nMljwRQIiDe4dix1kxNSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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