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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793d87f8a6d674a2ff05b73a9ca01fa96bf1f46f4ad63a5ff8b3a7e07642c877' 
  AND token = '97avAewoLFg3Y6JKrooZVqyvKZIW8ZhtER4JIijXaAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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