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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bf6ea452a7775c463786afc560d917e9d78d89eb5a30f65c6031152e16ec45' 
  AND token = 'V7XDeiXE8yeJRS224ISzJ/m2eZfpWT3hSnRf4aqoUlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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