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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7beb85e31c280d11edf24c94ac3b8b28e423b1f9770d249498a456285a90e111' 
  AND token = 'jeS7JJPux0b1IbPmoFqtHU+1zAo5T/1sBTioKLQKrD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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