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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903e0abafa79469c679516e189783f35568ad17ad7fd1cc19637947478ab614d' 
  AND token = 'd5PZP48LyVPmG+Cn8x4/vTf27TWdNTR7a4ozOw4HmGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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