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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e6cddd7610ffb341775962b8f03fef8ec3a0ffc08bbce6a1a4f9ea46cc13c9' 
  AND token = 'RT6ShfNFqK9+wzWoVfsfr3t7Hn3wrfBv1SNoVh5KkgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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