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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ab59839afe028b333aab35274e25d51296a1ffed8f96a0a937626285f92591' 
  AND token = '89U89TdaQsEhLjWNPcG77agfUV0yXN/CPYqx6iJv+5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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