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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8f180632a9210c27c82a4352d84229fe754afdf3e70d4d6f13b7b4c16d4ec6' 
  AND token = 'dk99bP7AiP4BNl2hn0ttjztiVFtSW2lgJ+c22wyFtT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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