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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88182b42de7c41d77c474db7b2a8963fc2148eb4530415d7818aec38d227a875' 
  AND token = 's2diIvXTGReE6r0uCaNGTLNm3nIHYdAtXIelmA25zH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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