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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bcfe8ebce1450d0e8083c82133622d6989b43bd412313cb896267c104dce23' 
  AND token = 'hUJbw9J8+1AOTDNWLZeAKgv9MbGX+GyA2Uni64rnrzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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