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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5b754b1967ccd34463588772bc547e7dec5d2a254f006e1cf0c7a4a567bf3f' 
  AND token = 'BBMrugWuNpvTi2V6X/iFYlLU5Kb6X8/zs3K8zpbM6YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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