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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b1e0bafafe646d2b22fa2faf471514d307e794e3bbac7d9d9c2f06a75a1e56' 
  AND token = 'Zq/7W6OgkKSel7gF3DTPrnxDCbKhlh+9sExbvBAgh4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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