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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec0e8e44e5fa385b6c599cb5964116997bdc04c8e9f4a101f98653889bd23bf' 
  AND token = 'J+ch0O3FHY1z3D1AisWAkOx8C9LmZdDafW+PrU7Qir0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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