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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d3162b528dfc60e30a93cf4e19fd0ac3ff7befefb840b812258bca1e1e9e9b' 
  AND token = '2XDo84WyKmQ5w0zYJJHby0NgtazIODTeZa/DfoSCMxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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