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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe92e7743b849d6ebed84d3d963f44ec9dacde1841a9aa1070f05b37e5f08d8c' 
  AND token = '8AYGkJ3T0aCTzrjlFT1lulSzIhSP92M863Mnu31t+sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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