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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb66c5ff4f21ef78c14eb5a6968e45df465d547036a8efcca3fde7f9bcdb022' 
  AND token = 'hp/6MEAuU5hkw4Fga8Za4PuCLmpN/1AYSi6m+0KpHsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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