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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262d90085c241003e08178e4b58d3485c30d7b9d8ed8199371fbd63fe4c4d4e5' 
  AND token = '07vIFSCNEB7Y+T8U4TQn1dvzXpX4ajYOBO+G8emiNE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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