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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6412779f8445c443ae7a0b26971d395939eac8b8fe71db5487b461866886a7' 
  AND token = '8mrgD3/Er1yoDGZoFvcZjHMlHAqhu9b4ViMIn9IoFlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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