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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53796452ec5d16e1b6ee2b7fd302774b4cc36e2405f45897e9ab9f651ac46c0d' 
  AND token = '91VVpD87jgvWCMocm0/H38EH9f/UDfiu2GbtZ7b6l44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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