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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f65d5c8e372fafa45580d8db902285b187b977a2bc74dbe3b87c6fa2b868c6a' 
  AND token = 'AlibtNilGWgdTyV6NsDFkL6osEKJe/NTyl2dvdw0fAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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