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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be554d7f73d438ad1172b513d19c9ce784a703d89a85725827c9ff8ef6f1c974' 
  AND token = 'xNtc7gw+Rvln995ZEK0Z1KXXMAKEfSDfLbcyqPbxmhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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