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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71e8350ebf3b255fcf909ce56907b522e7eb2473e60a3f3b6450588e51d1438' 
  AND token = 'EiJV3xtUyWAzisXZgYHkUkK7zyPTXuaqIG4yyqcXmho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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