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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11b5f26bdd2e69392284196f6239b02d985f09e4ec9c2f1db2853be526d3416' 
  AND token = 'dpa3DbUU/xWnAh67DFQ4kt1esTyWGCTgv73144+erG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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