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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7fb0f2c94e5bf3d86db093af8ec39269d719034d1f339fd77918c3a0cf39e4' 
  AND token = 'R0WeUFXVBxJq5KAW9deyuphsl7klI8RVGLB/Z4cRTYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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