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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29875ce5f235e65789bcd2dca4f6f7a97b69815eefaebf79ed0fd2fe566a0f54' 
  AND token = 'Tqc6Tj9FxQUe3wnsTR0dyYfl/pT/q9+s1FNaY41J/KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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