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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b719f807cc2f985416071bef36fa48f8b95734eea2370376dac1e7b0b496bcd2' 
  AND token = 'GZyr3S0+p0FVH0107A1oThREeh0ObDxYNfOGn3vzEjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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