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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c1186621a16ae0c931a9d126650e706f2c116564ed70bc858082665969a7fb' 
  AND token = 'Z/dOeEAfXaGlUaHJBtmAhfPwU75SE50qjNm0ErRgb8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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