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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6c6e0aeca4ab950bb86da2856f84c0f2b6d60ab3c95b9d4c957f3595063e9b' 
  AND token = 'lSZ7z6ewOa2t/c12nSRRQAK4VnKrcJKaAfMRadC3s9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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