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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9783344a9d2afd61692808348abb4b1e7018c567ae43220d63661c8700ab61e' 
  AND token = '5PKMqwLA2PrjEQvWMIVK4Se5nTg6QGreX50rB29ysks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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