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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835142c2b1dae661ff7912d3c31c8e50c858f2db21f1c79f53f6c4150403aa71' 
  AND token = 'o4XSapBzofe/t7is2h0js7/EfPYRkul9FfX1QqKrkiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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