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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4884ea97849bce2ecea4a5b0982261ca64867c6e9854193a7571281235b2c7c7' 
  AND token = 'FlUVvcrtZrGGIlCMWyv6OdroH2/sO/BbFFc3ey/qjjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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