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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94ff30dadf75d3531d486daaf50942b3b8169b34926ef2335a6df8faaea9a3b' 
  AND token = 'FQzbqmhDhmYQGUyB1q1tyDRrr+Ltm+7H00hTpVPmrGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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