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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d27c62c2b16c1af81704a14c640b9540dea518d0111370888985bbca0d73bd3' 
  AND token = 'thLg+gDyBpfOYMGc7rbvcTkD03R6xFHLTkNOn91NSig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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