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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ea19b8abe3950bd34e0a719694c927eaac97f68619d5c1a42a1236669b8b2a' 
  AND token = 'B2UVJTQ3Z2u44IkIxiOOuT2qpojzL9olkZ5jWdwEZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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