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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a89160094320b182586b6d26eecd5f4985b2b77006fb481946bbb1b7d49dc0' 
  AND token = 'njhYFPrYRq56FvQHh1r4U7fjn/PsES0K8va3NoLc1os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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