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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6214829705c030ab319b5bba0d114ed0d6ffeef67e6d8d831c4fad4519bf15e2' 
  AND token = 'toOSs/u6khCsoFVb1Nho59kT70EAul4Ksfd9HYBIlkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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