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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dc33a5879893134932bc0a0c58a237fef8ab5dce8085261b76ce93684d5718' 
  AND token = 'xt8PPPIx0D5vsrdwdWzgR41QiY4+Oao3iJHJ8zkI7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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