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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58b9e13f4c0d405b21439c9263a636670ec395815ad31091eb79f982b1f66c9' 
  AND token = 'RhEfrklQl41bw2TOrfbNKo46e4uyaLY3iUflc7BaNzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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