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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8bacf471c070704d898272abb0b54ef30bce676d3247d22761c2bb5e4319dc' 
  AND token = 'G9HTEIU8WxY4tsqjrlk+q93AbK6GXBou/7acFh+0f7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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