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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8828cb9fe51813cff4838273f06fa18b79c2b92095b09c4160291487b806b706' 
  AND token = 'O/hWeN1RtDuS2tTsKZ9cHQxgfvZ+da/vz6eBmIxKWYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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