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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d25195d9a77867cee026d1b3559b6c4243c0506959dc017fd9ad2861b12f4a' 
  AND token = 'Qww3lzWbsX7unurkHPjUNtWFPk9oBIc+oZGPHe/TUD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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