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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28f7cc62ae94a293e651129af86850c10e9195d6762f92d2e5e2a887c5459ec' 
  AND token = 'T5yi5q1bcAN2XJB5PpD+uT/B83J8RUyQ2n7p+ubs2KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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