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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaac19c91fec4101a8543d16d1b21b32b2781742c62dbf87463529b68f3c9b7' 
  AND token = 'I19Wuo+Fs7AdY87CGJVr8PC0YaZrCJfArcuRIpCwUY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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